Improvement in the mode of preparing white-lead paint



. UNITED STATES PATENT OFFICE.

JAMES N. TROVILLO, OF GHRISTIANSBURG, VIRGINIA.

IMPROVEMENT IN THE MODE OF PREPARING WHITE-LEAD PAINT- Specification forming part of Letters Patent No. 1,535, dated March 31, 1840.

To all whom it may concern:

Be it known that I, JAMES N. TROVILLO, of Ghristiansburg, in the county of Montgomery and State of Virginia, have invented a new and useful Improvement in the Mode of Preparing VVhite-Lead Paint, by which improvement at great saving of oil is effected without or nearly equal quantities of linseed-oil and'ot' pure water preparatory to grinding the'paint, and in subsequently reducing it to a proper consistence by the addition of the same material in the same proportions. In making this preparation I proceed in the following manner: I take a quantity of white lead, in the state of dry white lead, and for the purpose of exeinplification I will suppose this quantity to be one pound. To this I add one gill of water, which is to be thoroughly incorporated with the lead by carefully stirring them together. After this has been effected I add one gill of oil, which is in like manner to be thoroughly incorporated with the white lead and water by careful stirring. By this means a homogeneous mixture will be produced. When thus prepared the composition requires nothing more than to be reduced, as above described, to such a consistence as the nature of the workto whichit is to be applied may require. It maybe imagined that there would be a tendency in these heterogeneous materials to separate from each other; but it has been found by ample experience that t-helead has the effeet of retaining the water with great tenacity. This material appears in this case to produce an effect very nearly allied to that produced by lime or other alkaline matters in causing a union to take place between the oil and the water, and should any portion of water separate from the mass from heavy pressure in grinding it will again become incorporated by the simple process of stirring, and not only is the incorporation thus rendered perfect, but the quantity of paint produced in this way is much greater than when oil alone is incorporated with the same quantity of white lead. It is, in fact, nearly doubled, and it will cover a much larger surface than it will when prepared in the usual mode. If itis desired to produce 0th ercolors, they may be incorporated with the paint prepared as above indicated with perfect i'ac'ility.

I do not claim to be the first to have incorporated linseed-oil and water together in the preparation of paint with a view to economy in the use of the former article, this having been done by the aid of lime or other. alkaline substances; but

What I do claim is 'Ihe producing of this combination by the agency of white lead alone, substantially in the manner above set forth, for the purpose of producing a mixture to be employed as a paint applicable to all the objects to which whitelead paint is ordinarily applied.

JAMES N. TROVILLO.

Witnesses:

THos. P. JoNEs, GEORGE WEsT. 

